Triple differential cross section for electron impact ionization of molecules -- Pyrimidine (C$_{4}$H$_{4}$N$_{2}$), Tetrahydrofurfuryl alcohol (C$_{5}$H$_{10}$O$_{2}$) and Tetrahydropyran (C$_{5}$H$_{10}$O)*

Cross-section data for electron impact induced ionization of bio-molecules are important for modeling the deposition of energy within a biological medium and also for gaining knowledge of electron driven processes at the molecular level. Triply differential cross sections have been measured for the electron impact ionization of HOMO (7b$_{2})$ and 10a$_{1}$ orbitals of Pyrimidine, HOMO (28a) orbital of tetrahydrofurfuryl alcohol, and HOMO (15AA) orbital Tetrahydropyran by using the (e, 2e) technique. The experimental measurements will be compared with theoretical M3DW (molecular 3-body distorted wave) model calculations.